Voltage question

Stepdown converters are affordable or perhaps try using a variac. CD players don't consume much power so should be pretty easy to run off a variac.

Check the back of the CD player for input voltage.

As Eric says... if the voltage range covers 100 to 120 then no problem.
If it only says 100 volts I wouldn’t even plug it in.

Just to give you all some idea how absurd it is to think a few volts matters, I once ran a lithotripsy machine designed for 240 on 120. For you mathlexic types that's like half the voltage. That's a complex and highly computerized machine that generates shock waves that break kidney stones. Its a lot of power, precision, and an incredible amount of sensitive electronics. More pumps, motors, servos, microprocessors, transformers and high voltage power supplies (in excess of 60kV) than you can shake a stick at. You would think the thing wouldn't even run, or at least would throw error codes, or work but weakly, anything but what happened, which was nothing. Worked absolutely fine. Didn't even know about the voltage until after the fact.

The disconnect from reality, misinformation, and nervous nonsense surrounding all things electrical is simply off the charts.

Just to give you all some idea how absurd it is to think a few volts matters, I once ran a lithotripsy machine designed for 240 on 120. For you mathlexic types that's like half the voltage. That's a complex and highly computerized machine that generates shock waves that break kidney stones. Its a lot of power, precision, and an incredible amount of sensitive electronics. More pumps, motors, servos, microprocessors, transformers and high voltage power supplies (in excess of 60kV) than you can shake a stick at. You would think the thing wouldn't even run, or at least would throw error codes, or work but weakly, anything but what happened, which was nothing. Worked absolutely fine. Didn't even know about the voltage until after the fact.

The disconnect from reality, misinformation, and nervous nonsense surrounding all things electrical is simply off the charts.

@mc
Well said !!!